District 4 Mask

The District 4 mask layer allows a focal view of the geographic boundary of Idaho Transportation Department's (ITD) District 4, and removes neighboring districts feature visibility to improve legibility. The polygon is identified by a district ID number and provides a clean visual for organizing transportation operations used to define the operational zones for highway maintenance activities, resource allocation, and administrative oversight. District Boundaries and subsequently district masks are subject to change at the discretion of the Idaho Transportation Board. This content item is a sub-layer of the Cartographic Masks authoritative feature layer. Metadata第四分区遮罩图层（District 4 mask layer）可聚焦呈现爱达荷州交通运输部（Idaho Transportation Department, ITD）第四分区的地理边界，同时隐藏相邻分区的地理要素，以提升画面易读性。该面要素通过分区编号（district ID number）进行标识，可为交通运维组织工作提供清晰可视化支撑，用于划定公路养护作业、资源配置及行政监管的作业区域。分区边界及后续的分区遮罩可由爱达荷州交通运输委员会（Idaho Transportation Board）酌情调整。本内容项为制图遮罩权威要素图层（Cartographic Masks authoritative feature layer）的子图层。元数据（Metadata）